Overview
The TL431BIDRE4 is an adjustable precision shunt regulator produced by Texas Instruments. It is part of the TL431 series, which includes three-terminal adjustable shunt regulators known for their thermal stability across various temperature ranges. These devices are designed to provide a stable reference voltage and can be used in a wide range of applications, including on-board regulation, adjustable power supplies, and switching power supplies. The TL431BIDRE4 offers high precision and low output noise, making it an excellent replacement for Zener diodes in many circuits.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Reference Voltage Tolerance at 25°C | - | 0.5% (B Grade), 1% (A Grade), 2% (Standard Grade) | - | % |
| Adjustable Output Voltage | Vref (approximately 2.5V) | - | 36V | V |
| Operating Temperature Range | -40°C | - | 125°C | °C |
| Typical Temperature Drift | - | 6mV (C temp), 14mV (I temp, Q temp) | - | mV |
| Output Impedance | - | 0.2Ω | - | Ω |
| Sink-Current Capability | 1mA | - | 100mA | mA |
Key Features
- Adjustable output voltage from Vref (approximately 2.5V) to 36V using two external resistors.
- High precision with reference voltage tolerances of 0.5% (B Grade), 1% (A Grade), and 2% (Standard Grade) at 25°C.
- Low output noise and typical output impedance of 0.2Ω.
- Sink-current capability from 1mA to 100mA.
- Operation over a wide temperature range: –40°C to 125°C for Q-grade devices.
- Active output circuitry providing a sharp turn-on characteristic, making it suitable for replacing Zener diodes.
Applications
- On-board voltage regulation.
- Adjustable power supplies.
- Switching power supplies.
- Replacement for Zener diodes in various circuits.
- Automotive, commercial, and military applications due to its specified thermal stability.
Q & A
- What is the TL431BIDRE4 used for?
The TL431BIDRE4 is used as an adjustable precision shunt regulator in various applications such as on-board regulation, adjustable power supplies, and switching power supplies.
- What is the adjustable output voltage range of the TL431BIDRE4?
The output voltage can be adjusted from Vref (approximately 2.5V) to 36V using two external resistors.
- What are the reference voltage tolerances for the TL431BIDRE4?
The reference voltage tolerances are 0.5% (B Grade), 1% (A Grade), and 2% (Standard Grade) at 25°C.
- What is the operating temperature range for the TL431BIDRE4?
The device operates from –40°C to 125°C for Q-grade devices.
- What is the typical output impedance of the TL431BIDRE4?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431BIDRE4?
The sink-current capability ranges from 1mA to 100mA.
- Can the TL431BIDRE4 replace Zener diodes?
Yes, the TL431BIDRE4 can replace Zener diodes due to its active output circuitry and sharp turn-on characteristic.
- What are some common applications of the TL431BIDRE4?
- How does the TL431BIDRE4 achieve thermal stability?
The device is designed with specified thermal stability over applicable automotive, commercial, and military temperature ranges.
- What is the significance of the different grades (B, A, Standard) of the TL431BIDRE4?
The different grades (B, A, Standard) refer to the initial tolerances of the reference voltage at 25°C, which are 0.5%, 1%, and 2%, respectively.
